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Dr Brendan O’Sullivan


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Consultant Psychiatrist

Dr Brendan O’Sullivan is a senior Consultant Psychiatrist with with over 30 years of clinical experience.

Dr O’Sullivan graduated in Medicine from The University of Sydney. He also graduated from the Faculties Arts and Science at The University of Sydney obtaining First Class Honours. He is a Fellow of the Royal Australian and New Zealand College of Psychiatrists. He has extensive experience in Adult General Psychiatry in both the ‘public’ and the ‘private’ sectors and a strong background in medical research, University teaching and academia.

Dr O’Sullivan completed his PhD at The University of Sydney on the neuroendocrine and sleep disturbances of depressive disorders and schizophrenia and in identifying potential biological markers to improve patient outcomes and to predict relapse. He was then awarded a 2-year post-doctoral research fellowship at the Nobel Institute of Neurophysiology and Human Brain Mapping at the Karolinska University in Stockholm, Sweden. There he developed expertise in both Positron Emission Tomograhy (PET) and functional Magnetic Resonance Imaging (fMRI) brain mapping techniques, and he returned to Australia with these research skills to Head an NH&MRC-funded National Neuroimaging Consortium designed to encourage biological research.

Dr O’Sullivan was appointed in a conjoint position as Associate Professor of Psychiatry in the Faculty of Medicine at The University of Sydney, and as Senior Staff Specialist Psychiatrist at Royal Prince Alfred Hospital, Sydney. Professor O’Sullivan has been the recipient of numerous research awards and NH&MRC research grants and has published widely in international journals with more than 100 publications and over 1,000 citations.

Amongst his various other interests, Professor O’Sullivan was fluent in Deaf Sign Language (AUSLAN) and he opened the first national mental health specialist service for Deaf and Hearing-impaired Australians in 1994, also becoming a Patron of the Australian Tinnitus Association.

In 2007 Dr O’Sullivan left public practice to work in private practice in Macquarie Street, Sydney, where he cared for a full range of mental health issues including patients from the health professions and their family members, anxiety and mood disorders, work-related issues and drug and alcohol problems, as well as developing a practice in forensic and complex medico-legal matters.

After a decade in private practice in Sydney (and having raised his 4 own children to adulthood), Dr O’Sullivan decided to undertake work in rural and remote locations in Mildura, Bunbury, Cairns, Mackay, and also Townsville which provided fly-in outpatient clinics and tele-health services to outback indigenous communities from Mt Isa and through all of North-West QLD. As the Clinical Director of this service Dr O’Sullivan worked in difficult and demanding emergency situations, and in close collaboration with the Royal Australian Flying Doctor Service.

With the birth of his first grand-child, and his other daughter beginning her own medical career this year as an Intern, Dr O’Sullivan has now returned home to Sydney. He will continue his current work at South Pacific Private Hospital with drug and alcohol clients, but also working at Holdsworth House Medical Practice (College Street Specialists), where he will maintain his broad interests in all Adult General Psychiatry, especially in mood disorders, post-natal depression, anxiety disorders, PTSD, complex PTSD and other personality issues, schizophrenia, and all drug and alcohol problems.

Special Interests

  • Adult general psychiatry
  • Mood disorders
  • PTSD